Fixes corner cases in Lit

[dave]

Fixes:

#15
#14
#13
#12

[codecov-io]

Codecov Report

Merging #16 into master will increase coverage by 0.67%.
The diff coverage is 67.14%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   49.17%   49.84%   +0.67%     
==========================================
  Files          14       14              
  Lines        1873     1942      +69     
==========================================
+ Hits          921      968      +47     
- Misses        906      926      +20     
- Partials       46       48       +2

Impacted Files	Coverage Δ
jen/lit.go	69.44% <66.66%> (-5.56%)	❌
jen/tokens.go	67.36% <68.18%> (+0.69%)	✅

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